Self-excited switching power supply circuit

Details Self-excited switching power supply circuit Self-excited switching power supply circuit

2006-03-14

2006-03-14

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S050000, C363S055000

Reexamination Certificate

active

07012816

ABSTRACT:
A self-excited switching power supply circuit is provided which reduces a discharge current generated when an oscillating field effect transistor (3) is turned on, whereby it is possible to reduce energy loss and generation of noise when switching is executed. A time constant of an ON-control circuit (12, 23) is set such that when a polarity of a voltage of a feedback winding (2b) has reversed, a gate voltage of the oscillating field effect transistor (3) exceeds a threshold voltage VTH. Accordingly, after a voltage of a primary winding (2a) has become equal to or less than a power supply voltage, the oscillating field effect transistor (3) is turned on, and electrical charge stored in stray capacitance between the windings of the primary winding (2a) and in parasitic capacitance of the oscillating field effect transistor (3) is discharged gradually.

REFERENCES:
patent: 6078508 (2000-06-01), Okamura et al.
patent: 6137695 (2000-10-01), Takida et al.
patent: 6198637 (2001-03-01), Hosotani et al.
patent: 6285566 (2001-09-01), Nakahira et al.
patent: 6552623 (2003-04-01), Nishida et al.
patent: 6577511 (2003-06-01), Yamaguchi et al.
patent: 6862193 (2005-03-01), Nakata
patent: 2002-051546 (2002-02-01), None
Patent Abstracts of Japan for JP2002-051546 published on Feb. 15, 2002.

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